A dry process mixing tank

Abstract

This utility model provides a mixing tank for dry processes, comprising: a tank body and a stirring device. The tank body includes a cylindrical receiving cavity for containing raw materials to be mixed. The stirring device is installed inside the receiving cavity and includes a stirring shaft and at least one stirring blade located on the stirring shaft. The stirring diameter of the stirring blade is defined as D, and the diameter of the receiving cavity is defined as T, where D / T = 0.3–0.95. This utility model's mixing tank for dry processes can improve the technical problem of insufficient mixing in existing mixing tanks.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery preparation technology, and in particular to a mixing tank for dry process. Background Technology

[0002] Solid-state batteries are a novel battery technology that offers higher safety and energy density compared to traditional liquid batteries. The electrolyte in a solid-state battery is solid, eliminating the safety hazards associated with liquid electrolytes, such as leakage and combustion. Furthermore, the energy density of solid-state batteries is also improved due to the superior ion conductivity of solid-state electrolytes compared to liquid electrolytes.

[0003] In the manufacturing process of solid-state batteries, electrode preparation is a crucial step, as its performance directly affects the battery's performance. Currently, solid-state battery electrode preparation mainly employs a dry process. The dry process is carried out under anhydrous and solvent-free conditions, avoiding problems such as solvent residue and complex drying processes that may occur in liquid-phase processes. In the dry process, active materials, conductive agents, and binders are thoroughly mixed in a mixing tank, followed by calendering and other steps to form a thin-film electrode. However, during the mixing process using existing mixing tanks, it was found that insufficient mixing still exists, resulting in particle agglomeration after mixing and fiber formation after film formation, thus affecting electrode performance. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a mixing tank for dry process to improve the technical problem of insufficient mixing in existing mixing tanks.

[0005] This utility model provides a mixing tank for dry process, comprising: a tank body and a stirring device. The tank body includes a cylindrical receiving cavity for receiving raw materials to be mixed. The stirring device is installed in the receiving cavity and includes a stirring shaft and at least one stirring blade located on the stirring shaft. The stirring diameter of the stirring blade is defined as D, and the diameter of the receiving cavity is defined as T, where D / T = 0.3 to 0.95.

[0006] In one embodiment of this utility model, the number of stirring blades is a single one, wherein:

[0007] D / T = 0.4~0.55;

[0008] Alternatively, D / T = 0.6 to 0.95.

[0009] In one embodiment of this utility model, the number of stirring blades is at least two and they are spaced apart along the axial direction of the stirring shaft. The stirring diameter of one of the stirring blades is defined as D. M The stirring diameter of the other stirring blade is D. N ,in:

[0010] D M / T=0.5~0.95, D N / T = 0.3~0.5.

[0011] In one embodiment of this utility model, the number of stirring blades is at least three, including a first stirring blade, a second stirring blade, and a third stirring blade. The first stirring blade, the second stirring blade, and the third stirring blade are arranged at intervals along the axial direction of the stirring shaft. The stirring diameter of the first stirring blade is defined as D1, the stirring diameter of the second stirring blade is defined as D2, and the stirring diameter of the third stirring blade is defined as D3, wherein:

[0012] D1 / T=0.8~0.95, D2 / T=0.5~0.8, D3 / T=0.3~0.5.

[0013] In one embodiment of the present invention, the first stirring blade includes a first connecting piece and two first stirring pieces located on both sides of the first connecting piece. The middle part of the first connecting piece is fixedly installed on the stirring shaft. One side of the first stirring piece is connected to the first connecting piece, and the other side is inclined away from the direction of the third stirring blade. The side of the first stirring piece facing the raw material to be mixed during rotation is provided with a first cutting edge.

[0014] In one embodiment of the present invention, the second stirring blade includes a second connecting piece and two second stirring blades located on both sides of the second connecting piece. The second connecting piece and the two second stirring blades are located on the same axial section. The middle part of the second connecting piece is fixedly installed on the stirring shaft. The side of the second stirring blade facing the raw material to be mixed is provided with a second cutting edge during rotation.

[0015] In one embodiment of the present invention, the second stirring blade includes a stirring blade body, a movable stirring blade, and a driving member. The movable stirring blade is slidably connected to the stirring blade body, and the driving member drives the movable stirring blade to slide relative to the stirring blade body to adjust the stirring diameter D2 of the second stirring blade.

[0016] In one embodiment of the present invention, the third stirring blade includes a third connecting piece and third stirring pieces located on both sides of the third connecting piece. The middle part of the third connecting piece is fixedly installed on the stirring shaft. The edge areas of the two third stirring pieces away from the stirring shaft are arc-shaped and curved toward the direction of the first stirring blade. The side of the third stirring piece facing the raw material to be mixed during rotation is provided with a third cutting edge.

[0017] In one embodiment of the present invention, the stirring shaft includes a main body section for mounting stirring blades and a drive section disposed on the upper part of the main body section, the drive section being used to connect to a driving device.

[0018] In one embodiment of the present invention, the mixing tank for dry process further includes a drive device for driving the stirring shaft to rotate.

[0019] The beneficial effects of this utility model are as follows: The mixing tank for dry process proposed in this utility model has a stirring device installed in the containing cavity, and includes a stirring shaft and at least one stirring blade located on the stirring shaft. The stirring diameter of the stirring blade is defined as D, the diameter of the containing cavity is T, and D / T = 0.3~0.95. Compared with the prior art, this utility model can effectively improve the technical problems of insufficient mixing and easy agglomeration of particles after mixing by reasonably setting D / T. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the structure of a mixing tank for a dry process according to an embodiment of the present invention, wherein the impeller of the stirring device is a single-layer impeller with a specific diameter ratio.

[0023] Figure 2 A schematic diagram of the structure of a mixing tank for a dry process provided in another embodiment of the present invention, wherein the impeller of the stirring device is a double-layer stepped variable diameter impeller.

[0024] Figure 3 A schematic diagram of the structure of a mixing tank for a dry process provided in another embodiment of the present invention, wherein the impeller of the stirring device is a three-layer stepped variable diameter impeller.

[0025] Figure 4 Provided for an embodiment of this utility model Figure 3 A three-dimensional structural diagram of the stirring device;

[0026] Figure 5 Provided for an embodiment of this utility model Figure 3 A top view of the stirring device;

[0027] Figure 6 A schematic diagram of the structure of a mixing tank for a dry process provided in another embodiment of the present invention, wherein the impeller of the stirring device is a three-layer stepped variable diameter impeller.

[0028] Figure 7 Provided for an embodiment of this utility model Figure 6 Schematic diagram of the three-dimensional structure of the stirring device Figure 1 ;

[0029] Figure 8 Provided for an embodiment of this utility model Figure 6 Top view of the stirring device Figure 1 ;

[0030] Figure 9 Provided for an embodiment of this utility model Figure 6 Schematic diagram of the three-dimensional structure of the stirring device Figure 2 The second sub-blade is in the extended state;

[0031] Figure 10 Provided for an embodiment of this utility model Figure 6 Schematic diagram of the three-dimensional structure of the stirring device Figure 2 The second sub-blade is in a retracted state;

[0032] Figure 11 A simulation structural diagram of the stirring device provided in an embodiment of this utility model. Figure 1 ;

[0033] Figure 12 A simulation structural diagram of the stirring device provided in an embodiment of this utility model. Figure 2 ;

[0034] Figure 13 This is a schematic diagram of the simulation performance test of a mixing tank for a dry process according to an embodiment of the present invention, wherein Figures (a), (b), (c), (d), (e), and (f) are schematic diagrams of the stirring device under different mixing times;

[0035] Figure 14 This is a schematic diagram of the simulation performance test of a mixing tank for a dry process provided in another embodiment of the present invention, wherein Figures (a), (b), (c), (d), (e), and (f) are schematic diagrams of the stirring device under different mixing times.

[0036] The attached figures are labeled as follows:

[0037] 1. Tank body; 11. Receiving cavity; 2. Stirring device; 21. Stirring shaft; 211. Main body section; 212. Drive section; 213. Transition section; 22. First stirring blade; 221. First connecting plate; 222. First stirring blade; 223. First cutting edge; 23. Second stirring blade; 231. Second connecting plate; 232. Second stirring blade; 2321. Stirring blade body; 2322. Movable stirring blade; 233. Second cutting edge; 24. Third stirring blade; 241. Third connecting plate; 242. Third stirring blade; 243. Third cutting edge. Detailed Implementation

[0038] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0040] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0041] In light of the problems existing in the background technology, the inventors conducted a systematic analysis to address defects such as easy agglomeration of particles after mixing and easy stringing after film formation. They discovered that the particle size of the dispersed mixed particles and the time required for thorough mixing are related to the shear force of the stirring blades. The higher the single-point shear force at the blade tip, the better the particle dispersion; conversely, the greater the total shear force of the entire blade, the shorter the time required for thorough mixing. Furthermore, the shear force of the stirring blades is related to the ratio of the stirring blade diameter D to the inner diameter T of the tank. Based on this, this invention provides a mixing tank for dry processes. By setting the D / T ratio, this mixing tank can improve the problems of agglomeration and stringing in the mixing process, thereby achieving thorough and uniform dispersion of the mixed materials.

[0042] See Figures 1-14 The mixing tank for the dry process includes a tank body 1 and a stirring device 2. The tank body 1 includes a cylindrical receiving cavity 11 for receiving raw materials to be mixed. The shape of the tank body 1 can be any shape that is easy for those skilled in the art to conceive of, including but not limited to cylindrical, rectangular and other shapes.

[0043] The stirring device 2 is installed in the receiving cavity 11 and includes a stirring shaft 21 and at least one stirring blade located on the stirring shaft 21. The specific number of stirring blades can be one, two or more. The specific installation method of the stirring device 2 can adopt various structural forms that are easy for those skilled in the art to conceive of, such as the installation method of the blade shaft of a soy milk maker or meat grinder.

[0044] The specific installation method of the stirring blade and the stirring shaft 21 can also adopt various structural forms that are easy for those skilled in the art to think of, as long as there is no relative displacement between the stirring shaft 21 and the stirring blade during stirring. For example, it can be a fixed connection in one piece or a detachable connection in two pieces. The fixed connection in one piece includes, but is not limited to, welding, bonding, riveting, etc. The detachable connection in two pieces includes, but is not limited to, slot connection, snap-fit ​​and fixing, etc., so as to facilitate the replacement of the stirring blade, adjust the appropriate D / T ratio, and meet the actual use requirements.

[0045] Without replacing the impeller blades, the impeller blades can also be made of a retractable structure to adjust the appropriate D / T ratio. The retractable structure can take various forms readily conceived by those skilled in the art, such as the following... Figures 9-10 In the embodiment shown, the structure in which the driving component drives the movable stirring blade 2322 to slide relative to the stirring blade body 2321 is the same as that described below, and will not be repeated here. This structure allows for the adjustment of a suitable D / T ratio without the need to replace the stirring blade, thus meeting the actual usage requirements.

[0046] See Figures 1-14 The stirring diameter of the stirring blade is defined as D (i.e., the maximum outer diameter of a single stirring blade), and the diameter of the receiving cavity 11 is defined as T. D / T = 0.3 to 0.95. For example, D / T can be any value between 0.3 and 0.95, such as 0.3, 0.6, 0.8, 0.95, etc. By adjusting the ratio of D / T to between 0.3 and 0.95, compared to exceeding or falling below this range, the mixing tank can achieve more thorough mixing in a shorter mixing time, making it less likely for particles to agglomerate after mixing, less likely for the film to form fibers, and resulting in better electrode performance.

[0047] Although a D / T ratio between 0.3 and 0.95 is sufficient for achieving good mixing of common materials to be stirred in the battery industry, for optimal results, please refer to [the relevant documentation / reference needed]. Figure 1In one embodiment of this utility model, the number of stirring blades can be a single blade, or a single-layer blade with a specific diameter ratio. In this case, the blade diameter ratio (D / T) can be selected according to the target PTFE particle size to be mixed. When the target PTFE particle size is ≤0.5mm, D / T is set to 0.4 to 0.55. For example, D / T can be any value between 0.4 and 0.55, such as 0.4, 0.45, or 0.55. When the target particle size is >0.5mm, D / T is set to 0.6 to 0.95. For example, D / T is set to 0.5 to 0.7. For another example, D / T can be any value between 0.5 and 0.7, such as 0.5, 0.55, or 0.7. In this way, the particles are less likely to agglomerate after mixing, and the mixing effect is good.

[0048] Furthermore, the inventors discovered that, under the same driving power, short blades have higher tip shear force than long blades, while long blades have better overall shear force than short blades. Therefore, see [reference needed]. Figure 2 In another embodiment of this utility model, the number of stirring blades can be at least two and spaced apart along the axial direction of the stirring shaft 21, which can also be called double-layer stepped variable diameter blades. The stirring diameter of one of the stirring blades is defined as D. M The stirring diameter of the other stirring blade is D. N , where: D M / T = 0.5~0.95, for example, D M / T can be any value between 0.5 and 0.95, such as 0.5, 0.6, 0.8, 0.95, etc.; D N / T = 0.3~0.5, for example, D N / T can be any value between 0.3 and 0.5, such as 0.3, 0.4, 0.5, etc. In this way, by setting different diameter blades at different heights, a shear force gradient is formed in the axial direction. Compared with single-layer blades with a specific diameter ratio, the mixing effect is better, and the particles are less likely to agglomerate after mixing.

[0049] See Figures 3-14In another embodiment of this utility model, the number of stirring blades can be at least three, including a first stirring blade 22, a second stirring blade 23, and a third stirring blade 24. The first stirring blade 22, the second stirring blade 23, and the third stirring blade 24 are arranged at intervals along the axial direction of the stirring shaft 21, which can also be called a three-layer stepped variable diameter blade. The stirring diameter of the first stirring blade 22 is defined as D1, the stirring diameter of the second stirring blade 23 is defined as D2, and the stirring diameter of the third stirring blade 24 is defined as D3, wherein: D1 / T = 0.8~0.95 (also called large diameter blade), for example, D1 / T can be any value between 0.8 and 0.95, such as 0.8, 0.85, 0.95; D 2 / T = 0.5~0.8 (also known as medium diameter blade), for example, D2 / T can be any value between 0.5 and 0.8, such as 0.5, 0.6, 0.8; D3 / T = 0.3~0.5 (also known as small diameter blade), for example, D3 / T can be any value between 0.3 and 0.5, such as 0.3, 0.4, 0.5; In this way, by setting blades of different diameters at different heights, a shear force gradient is formed in the axial direction. Large diameter blades realize wide-range material conveying, medium diameter blades realize transitional dispersion, and small diameter blades realize high-intensity shearing and anti-agglomeration. Compared with single-layer specific diameter ratio blades and double-layer stepped variable diameter blades, the mixing effect is better, and the particles are less likely to agglomerate after mixing. In specific implementations, the upper layer can be either large-diameter blades (D / T = 0.8–0.95) or small-diameter blades (D / T = 0.3–0.5), the middle layer can be medium-diameter blades (D / T = 0.5–0.8), and the lower layer can be either small-diameter blades (D / T = 0.3–0.5) or large-diameter blades (D / T = 0.8–0.95), which can be flexibly set according to needs. In other embodiments, the number of stirring blades can be 4, 5, 6, etc.

[0050] See Figures 3-4 The first stirring blade 22 may include a first connecting piece 221 and two first stirring blades 222 located on both sides of the first connecting piece 221. The middle part of the first connecting piece 221 is fixedly installed on the stirring shaft 21. One side of the first stirring blade 222 is connected to the first connecting piece 221, and the other side is inclined away from the third stirring blade 24. During the rotation, the side of the first stirring blade 222 facing the raw material to be mixed is provided with a first cutting edge 223. In this way, during the mixing process, the inclined stirring blade will generate axial thrust, which will apply axial force to the material and push the material to form an up-and-down circulating flow in the receiving cavity 11, thereby improving the mixing efficiency and achieving a good mixing effect.

[0051] See Figures 3-4The second stirring blade 23 may include a second connecting piece 231 and two second stirring blades 232 located on both sides of the second connecting piece 231. The second connecting piece 231 and the two second stirring blades 232 are all located on the same axial section. The middle part of the second connecting piece 231 is fixedly installed on the stirring shaft 21. The side of the second stirring blade 232 facing the raw material to be mixed during rotation is provided with a second cutting edge 233, so that a double-edged symmetrical shear is formed on the same axial section, which can better break up and mix the agglomerate during the mixing process, improve the mixing efficiency, and achieve a good mixing effect.

[0052] See Figures 9-10 The second stirring blade 232 may include a stirring blade body 2321, a movable stirring blade 2322, and a driving component (not shown). The movable stirring blade 2322 is slidably connected to the stirring blade body 2321. The driving component drives the movable stirring blade 2322 to slide relative to the stirring blade body 2321 to adjust the stirring diameter D2 of the second stirring blade 23, i.e., the adjustable blade. This allows for adjustment of the extension length of the second blade by using the driving component to drive the movable stirring blade 2322 relative to the stirring blade body 2321, thereby adjusting the stirring diameter D2 of the second stirring blade 23. In the coarse mixing stage, the movable stirring blade 2322 can extend, becoming a long blade with a large D / T, achieving rapid mixing. In the fine dispersion stage, it can contract into a short blade with a small D / T, achieving enhanced shearing. The driving component driving the movable stirring blade 2322 to slide relative to the stirring blade body 2321 can adopt various structural forms readily conceived by those skilled in the art, including but not limited to hydraulic and electric actuators.

[0053] See Figures 3-4 The third stirring blade 24 may include a third connecting piece 241 and third stirring blades 242 located on both sides of the third connecting piece 241. The middle part of the third connecting piece 241 is fixedly installed on the stirring shaft 21. The edge area of ​​the two third stirring blades 242 away from the stirring shaft 21 is an arc shape that bends toward the direction of the first stirring blade 22. During the rotation, the side of the third stirring blade 242 facing the raw material to be mixed is provided with a third cutting edge 243. In this way, during the mixing process, the arc-shaped third stirring blade 242 will scoop the material upward and generate a strong axial backflow, which works in conjunction with the first blade to form a three-dimensional circulation, improves the mixing efficiency, and has a good mixing effect.

[0054] See Figure 4 The stirring shaft 21 may include a main body section 211 for mounting stirring blades and a drive section 212 disposed on the upper part of the main body section 211. The drive section 212 is used to connect to a drive device to facilitate the drive device to drive the stirring shaft 21.

[0055] See Figure 4The axial cross-section of the drive section 212 can adopt various shapes readily conceived by those skilled in the art, including but not limited to a regular hexagon. The size of the main body section 211 is larger than that of the drive section 212, and a transition section 213 can be provided between the main body section 211 and the drive section 212. In this way, the stirring shaft 21 adopts a variable diameter structure, and the transition section 213 is provided at the variable diameter point, which improves the overall rigidity of the stirring shaft 21 and facilitates the connection of the drive device. The mixing tank for dry process also includes a drive device for driving the stirring shaft 21 to rotate. The drive device can adopt a conventional structure in the art, which is not the focus of this application and will not be described in detail here.

[0056] based on Figures 3-12 The present invention further verifies the technical solution disclosed in the illustrated embodiment using finite element simulation:

[0057] As an example, see Figure 5 and Figure 11 The dry process shown uses a mixing tank to simulate and analyze conventional mixed particles. The parameters are: D1 = 412 mm for the first stirring blade 22, D2 = 600 mm for the second stirring blade 23, D3 = 750 mm for the third stirring blade 24, and T = 830 mm for the tank's accommodating cavity 11. The ratios D1 / T are set to 0.3-0.5, D2 / T to 0.5-0.8, and D3 / T to 0.8-0.95. Please refer to [link to relevant documentation]. Figure 9 From (a)-(f), it can be seen that after 15 seconds of mixing, the mixed particles in the lower part of the tank have been completely dispersed, with only a small amount of agglomeration remaining in the upper part of the tank. It should be noted that... Figure 9 The image in (f) is a simulation view after 15 seconds of mixing. However, after 20-25 seconds, the mixed particles in the upper and lower parts of the tank have been completely dispersed. Compared with the existing technology, the required mixing time is shorter, and it can effectively improve the technical problems of insufficient mixing and easy agglomeration of particles after mixing in the existing mixing tank.

[0058] As another embodiment, please refer to Figure 8 and Figure 12 The dry process shown uses a mixing tank to simulate and analyze conventional mixed particles. The following parameters are used: D1 = 688 mm for the first stirring blade 22, D2 = 550 mm for the second stirring blade 23, D3 = 350 mm for the third stirring blade 24, and T = 750 mm for the tank's accommodating cavity 11. The desired ratios are: D1 / T = 0.8-0.95, D2 / T = 0.5-0.8, and D3 / T = 0.3-0.5. Please refer to [link to relevant documentation]. Figure 10As shown in (a)-(f), after 15 seconds of mixing, the mixed particles in the upper and lower parts of the tank have been completely dispersed, and there is no particle agglomeration in the tank. Compared with the above embodiment, the required mixing time is shorter, and the technical problem of insufficient mixing and easy particle agglomeration after mixing in the existing mixing tank is more effectively improved.

[0059] In summary, this invention addresses the three major pain points of existing dry process mixing tanks: long mixing time, low mixing uniformity, and easy agglomeration of discharged particles. It proposes a structurally optimized dry process mixing tank. By rationally setting the D / T ratio, this mixing tank significantly shortens the mixing time required for uniform dispersion while maintaining the same tank volume, and significantly suppresses agglomeration. Furthermore, experimental verification shows that under the same conditions, the mixing time of this invention is reduced by 30% to 50% compared to traditional structures, and the mixing uniformity is improved by more than 50% for the same mixing time, effectively improving the technical problems of insufficient mixing and easy particle agglomeration after mixing in existing mixing tanks.

[0060] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A mixing tank for a dry process, characterized in that, include: The tank body includes a cylindrical receiving cavity for containing raw materials to be mixed; A stirring device, which is installed in the receiving cavity, and includes a stirring shaft and at least one stirring blade located on the stirring shaft; Wherein, the stirring diameter of the stirring blade is defined as D, the diameter of the receiving cavity is defined as T, and D / T = 0.3 to 0.

95.

2. The mixing tank for dry process according to claim 1, characterized in that, The number of stirring blades is single, wherein: D / T = 0.4~0.55; Alternatively, D / T = 0.6 to 0.

95.

3. The mixing tank for dry process according to claim 1, characterized in that, The number of stirring blades is at least two and they are spaced apart along the axial direction of the stirring shaft. The stirring diameter of one of the stirring blades is defined as D. M The stirring diameter of the other stirring blade is D. N ,in: D M / T=0.5~0.95,D N / T=0.3~0.5。 4. The mixing tank for dry process according to claim 1, characterized in that, The number of stirring blades is at least three, including a first stirring blade, a second stirring blade, and a third stirring blade. The first stirring blade, the second stirring blade, and the third stirring blade are spaced apart along the axial direction of the stirring shaft. The stirring diameter of the first stirring blade is defined as D1, the stirring diameter of the second stirring blade is defined as D2, and the stirring diameter of the third stirring blade is defined as D3, wherein: D1 / T=0.8~0.95, D2 / T=0.5~0.8, D3 / T=0.3~0.

5.

5. The mixing tank for dry process according to claim 4, characterized in that, The first stirring blade includes a first connecting piece and two first stirring blades located on both sides of the first connecting piece. The middle part of the first connecting piece is fixedly installed on the stirring shaft. One side of the first stirring blade is connected to the first connecting piece, and the other side is inclined away from the direction of the third stirring blade. The side of the first stirring blade facing the raw material to be mixed during rotation is provided with a first cutting edge.

6. The mixing tank for dry process according to claim 4, characterized in that, The second stirring blade includes a second connecting plate and two second stirring blades located on both sides of the second connecting plate. The second connecting plate and the two second stirring blades are located on the same axial section. The middle part of the second connecting plate is fixedly installed on the stirring shaft. The side of the second stirring blade facing the raw material to be mixed is provided with a second cutting edge during rotation.

7. The mixing tank for dry process according to claim 6, characterized in that, The second stirring blade includes a stirring blade body, a movable stirring blade, and a driving component. The movable stirring blade is slidably connected to the stirring blade body, and the driving component drives the movable stirring blade to slide relative to the stirring blade body to adjust the stirring diameter D2 of the second stirring blade.

8. The mixing tank for dry process according to claim 4, characterized in that, The third stirring blade includes a third connecting plate and third stirring blades located on both sides of the third connecting plate. The middle part of the third connecting plate is fixedly installed on the stirring shaft. The edge areas of the two third stirring blades away from the stirring shaft are arc-shaped and curved toward the direction of the first stirring blade. The third stirring blade has a third cutting edge on the side facing the raw material to be mixed during rotation.

9. The mixing tank for dry process according to claim 1, characterized in that, The stirring shaft includes a main body section for mounting stirring blades and a drive section disposed on the upper part of the main body section, the drive section being used to connect to a driving device.

10. The mixing tank for dry process according to claim 9, characterized in that, The mixing tank for the dry process also includes a drive device for rotating the stirring shaft.

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